Acta Veterinaria et Zootechnica Sinica ›› 2025, Vol. 56 ›› Issue (2): 603-610.doi: 10.11843/j.issn.0366-6964.2025.02.012

• Animal Genetics and Breeding • Previous Articles     Next Articles

Effects of Sirt1 Deacetylase on Proliferation and Differentiation of Bovine Skeletal Muscle Satellite Cells

ZHANG Zhengyu(), YANG Peihong, GUO Hong, LI Xin, ZHANG Linlin, GUO Yiwen, HU Debao, DING Xiangbin*()   

  1. Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Breeding, School of Animal Science and Animal Medicine, Tianjin Agricultural University, Tianjin 300384, China
  • Received:2024-08-01 Online:2025-02-23 Published:2025-02-26
  • Contact: DING Xiangbin E-mail:2203010125@stu.tjau.edu.cn;xiangbinding@tjau.edu.cn

Abstract:

The aim of this study was to investigate the effect of silent information regulator 2-related enzyme1 (Sirt1) on proliferation and myogenic differentiation of BSMSCs. In this experiment, small fragments of interfering RNA (siRNA) and overexpressed plasmid targeting Sirt1 were transfected into primary satellite cells stripped from the thigh muscle of 3-4-month-old fetal cattle. RNA and protein samples were collected at specific time points during the proliferation and differentiation stages, with 3 biological replicates per treatment. Real-time quantitative PCR (qRT-PCR) and Western blotting were used for analysis. In addition, EdU staining experiments were performed to evaluate cell proliferation.The results showed that the number, length, and diameter of muscle ducts were significantly increased by Sirt1 knockdown under a 40-fold microscope during cell differentiation. qRT-PCR and Western blotting confirmed that compared with the control group, mRNA levels of differentiation markers myosin heavy chains (MyHC) and myogenin (MyoG) were significantly up-regulated after interfering Sitr1 (P < 0.01). The protein expression level of MyoG was also significantly increased (P < 0.05) after interfering Sitr1. Conversely, Sirt1 overexpression resulted in a significant reduction in the number, length, and diameter of muscle ducts. Western blotting showed that the expression of MyoG in Sirt1 overexpression group was significantly lower than that in control group (P < 0.01). At the proliferation stage of BSMSCs, qRT-PCR, Western blotting and EdU tests showed that Sirt1 knockdown and overexpression had no significant effects on cell proliferation (P>0.05). In summary, Sirt1 knockdown can effectively promote cell differentiation, while overexpression can inhibit the process, but has no significant effect on proliferation. These findings confirm that Sirt1 is an important factor regulating the myogenic differentiation of BSMSCs, and plays a key role in coordinating myoblast differentiation and promoting myotube formation.

Key words: Sirt1, bovine skeletal muscle satellite cells, cell proliferation, myogenic differentiation

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